I just think that they would recommend a mast from a mast company, but not one from a competing sail company.

anyway, have fun!!

I found that odd too

Either way, I've used the 460 Ezzy RDM (91%) and the 460 KA RDM (100%) on my Ezzy Zephyr 7.5 and found that both worked really well. That Peterman test shows the 400 ezzy rdm having a T:77.9 B:63.4, which is very close to the KA bend curve of T:77.5% B:64%. I also like the fact that the KA has the reinforced material (silver stuff) on the exposed area and where the cams would go (SDM only, RDM only has it on the exposed cutout area).

Have never used the Lion but if it's similar to the infinity, I preferred it with an SDM

there are far more sail company brands than OEM's. the trick is to know which OEM's will work with which sails. quite often Ezzy's work well on SDM powerX, and epic masts. they have a bend and reflex far different than no limitz RDM's.

In the focus on RDM versus SDM for sails with cambers brings up the issue of camber size and shape. In my past experience, cambers for SDMs are much bigger, particularly right above and below the boom area. To work well, a camber needs to seat and rotate off the curved mast surface. However, I have to admit that I haven't been using cambered sails for a least 8-9 years. Maybe they have cambers now that modify their mast bearing area to suit either RDMs or SDMs, but I would tend to doubt it. Any sloppiness in the luff sleeve and the leading edge of the sail due to improperly sized cambers will work to distort the foil and affect rotation.

If I was you, I would question the Ezzy folks about their camber design and it's suitability for different diameter masts.

One measures the diameter of the mast where the cambers are located with a measuring tape that is provided with the sail. then you look up the diameter and which cam it is on a chart. The chart tells you what size cam and which pocket to use for that cam.

It's a great system and dials in cam tension and all that stuff perfectly for whatever diameter mast you have.

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